(3х+1)(5х-1)=(х+2(3х-4)-7х

Question

(3х+1)(5х-1)=(х+2(3х-4)-7х

Answer 1

15х-3х+5х-1=3х^2-4х+6х-8-7х
-3х^2+22х+6=0
Д=в^2-4*a*c=484+72=556
x1= (-22-2корня из139)/2
х2=(-22+2корня из139)/2